git-release

#!/bin/sh

set -e

if [[ $# != 1 && $# != 2 ]] ; then
    >&2 echo "Usage: git release <version-to-increment> [<remote>]"
    exit 1
fi

if [[ $# == 2 ]] ; then
    REMOTE=$2
else
    REMOTE=origin
fi

echo "Pulling changes"
git pull "$REMOTE"

echo "Updating tags from remote $REMOTE"
git fetch "$REMOTE" --tags --force

UNCOMMITTED_CHANGES=`git status -s | wc -l`
if [[ $UNCOMMITTED_CHANGES != 0 ]] ; then
    read -p "There are uncommitted changes. Do you wish to continue anyway? (y/n) " ANSWER
    if [[ $ANSWER != "y" ]] ; then
        exit 1
    fi
fi

set +e
CURRENT_VERSION=`git describe --abbrev=0 --match 'v[0-9]*.[0-9]*.[0-9]*' 2> /dev/null`
if [[ $? != 0 ]] ; then
    CURRENT_VERSION="v0.1.0"
fi
set -e

SEMVER_REGEX='^v([1-9][0-9]*|0)\.([1-9][0-9]*|0)\.([1-9][0-9]*|0)$'
if [[ ! "$CURRENT_VERSION" =~ $SEMVER_REGEX ]] ; then
    >&2 echo "The current version ($CURRENT_VERSION) is not semver compatible"
    exit 1
fi

MAJOR=${BASH_REMATCH[1]}
MINOR=${BASH_REMATCH[2]}
PATCH=${BASH_REMATCH[3]}

MAJOR_NAME="major"
MINOR_NAME="minor"
PATCH_NAME="patch"

if [[ $1 == "$MAJOR_NAME" ]] ; then
    MAJOR=$((MAJOR + 1))
    MINOR=0
    PATCH=0
elif [[ $1 == "$MINOR_NAME" ]] ; then
    MINOR=$((MINOR + 1))
    PATCH=0
elif [[ $1 == "$PATCH_NAME" ]] ; then
    PATCH=$((PATCH + 1))
else
    >&2 echo "Invalid version value: supported values are '$MAJOR_NAME' '$MINOR_NAME' '$PATCH_NAME'"
    exit
fi

NEW_VERSION="v$MAJOR.$MINOR.$PATCH"
read -p "New version will be '$NEW_VERSION'. Are you sure? (y/n) " ANSWER

if [[ $ANSWER != "y" ]] ; then
    exit 1
fi

echo "Pushing any local commits"
git push "$REMOTE"

echo "Tagging current commit with version $NEW_VERSION"
git tag -a "$NEW_VERSION" -m "$NEW_VERSION"

echo "Pushing tag $NEW_VERSION to $REMOTE"
git push "$REMOTE" "$NEW_VERSION"